Pre-Neogene Tectonics of the Sea-Of-Japan Region: a View from the Russian Side Alexander I Khanchuk

Pre-Neogene tectonics of the Sea-of-Japan region: A view from the Russian side Alexander I Khanchuk 55® 5 Щ (200№9Я) 275-291Я Ш\ Earth Science vol. 55, no. 5, 275—291(2001) Й Ш '? 5 5 # , 275 -— 291 (2001 l£) Earth Science (Chikyu Kagaku) vol. 55, 275-291. 2001 2 7 5 Pre-Neogene tectonics of the Sea-of-Japan region: A view from the Russian side Alexander I Khanchuk* * A b stract This is a review paper presenting an original regional plate-tectonic model based on the data recently obtained on the geological structure and history of the Sea-of-Japan region. Several paleogeographic schemes for the Jurassic-Cretaceous time represent the author’s geodynamic model for the development of this region. This model is clearly distinctive from the previous ones by postulating that the Californian-type transform margin has been one of the most significant geodynamic settings in the Mesozoic-Cenozoic East Asia. The author’s paleogeodynatnic model includes a geologic reconstruction of the pre-Neogene position of the Japanese Islands according to which the Central Sikhote-Alin, Tanakura and Median faults were parts of a single Early Cretaceous tectonic line. In addition, Early Cretaceous and Paleogene transform plate boundaries, Jurassic and Late Cretaceous supra-subduction continental margins, and Early Cretaceous island arc are recognized. The Early Cretaceous strike-slip movements likely resulted in a gigantic S-form structure of Sikhote Alin. Some Early Cretaceous and Paleogene magmatic rocks are recognized to indicate specific geodynamic structures, namely “slab windows”. K e y W o r d s : plate tectonics. East Asia, Paleozoic, Mesozoic, Cenozoic, Californian-type transform margin, slab window. considered to be fruitful if it does not grow into revision of Introduction the basic ideas o f plate tectonics, which in the last twenty- This is a review paper presenting original regional plate- year period has been supported by various scientific facts. tectonic models based on the data recently obtained on the Among them are the recent plate motions recorded by the geological structure and history o f the Sea-of-Japan region. direct instrumental observations and paleomagnetic data, d if Paleogeodynamic analysis is used herein as a research method ferent sedimentation rates between continental margins and related to the theory of plate tectonics. This method applies oceanic environments reported by the deep-sea drilling, etc. in retrospect the models of geodynamic settings existing now During the last decade, in the region under consideration, between and inside the modem lithospheric plates. Currently, several researches and reviews on accretionary, collisional, most researchers believe that plate tectonics is based on con strike-slip, and rifting paleogeodynamics have been carried vective flows within the upper mantle, while plume tectonics out (Khanchuk et al. 1989a ; Utkin 1989, 1999 ; Zonenshain is connected with some hot and high-density flows ascending et al. 1990 ; Natal’ in 1991 ; Nokleberg et al. 1994. 1998 ; from the Earth's core toward the lower mantle (Dobretsov Sengor and Natal’in 1996 ; Bogdanov and Filatova 1999). and Kirdyashkin 1994 ; Maruyama 1994 ; Rundkvist et al. A concept of the pre-Neogene tectonics in the Sea-of-Ja- 2000). Definite rock assemblages and tectonic movements, pan region is related to the reconstruction of the East Asian whose specific features are used for paleogeodynamic recon continental margin as it was before the opening of the Sea of struction, characterize each geodynamic setting. A lack of Japan. The new version of correlation between tectonic struc information on deep-seated rocks in the modem environments tures o f the Russian and Japanese sides o f the sea, which is as well as evolutionary changes o f the mantle composition discussed in this paper, has been made according to the sce sufficiently limits application of paleogeodynamic analysis. narios based on the paleomagnetic data and Miyashiro-type Nevertheless, the method is widely used as it has given re orogeny (Otofuji 1996 ; Maruyama 1997). searchers an additional instrument to evaluate a validity of Major structural elements of the southern the retrospective models that have been made using another Far East Russia approach. Recently, even geologists who did not adopt the plate tectonics concept apply some elements o f paleo Various types o f geodynamic settings repeatedly appeared geodynamic analysis in their works. Polemics on this issue is in the geological history o f the study region. Related struc- Received March 30, 2001. Accepted October 3, 2001. * Far East Geological Institute, 159, Stoletiya Vladivostoka Av.. Vladivostok, 690022, Russia E-mail : [email protected] ( 1 3 ) 276 Alexander I Khanchuk Fig. 1. Major tectonic units of the East Asia basement formed prior to the Sea-of-Japan opening (modified after Khanchuk and Ivanov 1999). ( 14) Pre-Neogene tectonics of the Sea-of-Japan region 277 tures and rocks are clearly divided into complexes of the two ered as portions of the Sino-Korean craton and surrounding types : ( 1 ) heterogeneous blocks of the basement bounded by Early Paleozoic orogenic belts. However, our study shows faults (terranes) ; and ( 2 ) overlying assemblages composed that the Khanka massif is heterogeneous, and includes par of volcanic and sedimentary rock sequences separated from ticular terranes as follows (Khanchuk et al. 1996). each other and from underlying terranes by sedimentary (strati Voznesenka terrane graphic) contacts. In addition, the belts of intrusions, which The Voznesenka terrane consists of the Late Riphean(?) - occur across and/or along the boundary of different terranes, Cambrian terrigenous and carbonate rocks deposited in a con are distinguished (Parfenov et al. 1998). tinental-margin environment and intruded by the Early Or Recently a considerable progress has been achieved on iden dovician (450 Ma) and Late Silurian (411 Ma) granites tification of geodynamic nature of major structural units of (Belyatsky et al. 1999 ; Khetchikov et al. 1995). the southern Far East. O f particular value are the works by Spassk terrane Parfenov (1984) and Natal’in (1991) who have developed the The Spassk terrane or suture (Natal’in 1991) is recognized principal paleogeodynamic models. A t the same time, because to the north o f the Voznesenka terrane. The Spassk terrane is of a lack of information available, many ideas remain to be an accretionary-wedge terrane, and is composed of Early Pa discussed. A generalized tectonic scheme of the East Asian leozoic turbidites containing blocks of Cambrian ophiolite, basement and its overlying assemblages are represented in chert, and limestone. In its typical subduction melange known Figs. 1 and 2, respectively. Therein, the generally accepted as the “ sandy-shale” suite (Khanchuk et al. 1996), well-pre structural units: the North Asian (Siberian) Craton, Khanka served blocks of oceanic ribbon chert with abundant Cam and Bureya massifs, all evolved as continents or their parts brian microfossils have been found (Kemkin and Rudenko since Middle Paleozoic time, are clearly distinguished from 1997). the epioceanic orogenic belts varying in age of the main fold Khanka and Bureya massifs to the north of the Spassk terrane ing and formation of their continental lithosphere. The latter In the Khanka and Bureya massifs to the north of the Spassk are the Mongol-Okhotsk (Mesozoic), the Sikhote Alin-North terrane, the metamorphic domes showing the greenschist to Sakhalin (Early-Late Cretaceous), and the Sakhalin (Paleo granulite facies metamorphism predominate. The Late gene) belts. In addition, some researchers have distinguished Riphean-Cambrian limestone, ophiolite, and siliceous-terrig the Okhotsk-Koryak orogenic belt (Khanchuk and Belyaeva enous deposits represent an original rock assemblage o f the 1993). Let us dwell on the questions that remain to be dis massifs. There is no evidence fo r the previously suggested cussed and solved. Archean or Lower Proterozoic age of the deeply metamor phosed rocks from the Khanka and Bureya massifs. The age Bureya- Khanka-Jiamusi (BKJ) superterrane of the initial low-temperature metamorphism of the Khanka Khanka and Bureya massifs massif rocks, based on Sm-Nd isotopic dating, is 733 ± 25 The Khanka and Bureya massifs as well as several massifs m.y. (Mishkin et al. 2000). The recent ion-probe analyses of located in China (the Jiamusi and some others) are regarded zircon grains from granulitic rocks of the Jiamusi massif here as elevations o f ancient crystalline rocks situated inside showed that the correspondent metamorphism occurred 502 the Middle Paleozoic superterrane that has not been named in ± 8 and 498 ± 11 Ma, that is in the Late Cambrian (Wilde et literature yet. Below it is noted as the BKJ (Bureya-Khanka- al. 1997). A t the same time, the granulites o f the Jiamusi massif Jiamusi) superterrane. This structure is distinguished as a com are considered by most researchers to be similar to those of bined tectonic unit since its components altogether are the Khanka massif. bounded by the same fold belts, namely Nora-Soukhotin ac Overlying assemblage of the Bureya and Khanka massifs cretionary complex to the west and the Cheongjin accretion The strata overlying the Bureya and Khanka massifs range ary complex (named as belts in Fig. 1) to the south, both of in age from Silurian to Cenozoic. In the Khanka massif, the which are of Late Paleozoic age. These complexes were re Upper Ordovician-Silurian terrigenous deposits are distrib sulted from the closure o f the western and eastern branches uted. Continental and shallow-water sedimentary, volcanic o f an ocean basin existed in between the North-China and and plutonic rocks formed in relation to rifting during Devo Bureya-Khanka-Jiamusi continents during the Mid-Late Pa nian-Carboniferous time. The magmatic rocks are mostly leozoic time. rhyolites (95%) and belong to the bimodal series. Basalts are According to another plate tectonic model (Sengor and characterized by high titanium and aluminum contents.

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